HTML 表单和输入

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submit 定义提交按钮。提交按钮会把表单数据发送到服务器。

例子：

int fr[] 262,262,262,262,294,330,440,392,330,392,392,392,\ 523,523,523,523,523,523,330,330,392,523,523,523,523,523,\ 392,392,392,330,330,294,262,294,294,294,294,294,294,294,330,294,262,294,\ 262,262,262,262,294,330,440,392,330,392,392,523,523,523,523,523,\ 523,330,440,392,392,523,523,523,523,523,440,392,392,440,330,\ 330,294,262,262,294,294,294,330,330,392,294,330,262,262 。拟开发土地431,028,848.87431,028,848.87 978,876,262.79978,876,262.79。新增到站提醒(8684闹铃)功能，让你实时掌握每路公交动向，加上附近站点搜索(8684地图)、实时问路(8684广场)、查询(8684出行)、线路纠错等多种实用工具，更好地助你出行。

1 <form action="/example/html/form_action.asp" method="get">
2   <p>Email: <input type="text" name="email" /></p>
3   <p>Pin: <input type="text" name="pin" maxlength="18" /></p>
4   <input type="submit" value="Submit" />
5 </form>

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text 定义单行的输入字段，用户可在其中输入文本。默认宽度为 20 个字符。

int fr[] 262,262,262,262,294,330,440,392,330,392,392,392,\ 523,523,523,523,523,523,330,330,392,523,523,523,523,523,\ 392,392,392,330,330,294,262,294,294,294,294,294,294,294,330,294,262,294,\ 262,262,262,262,294,330,440,392,330,392,392,523,523,523,523,523,\ 523,330,440,392,392,523,523,523,523,523,440,392,392,440,330,\ 330,294,262,262,294,294,294,330,330,392,294,330,262,262 。拟开发土地431,028,848.87431,028,848.87 978,876,262.79978,876,262.79。新增到站提醒(8684闹铃)功能，让你实时掌握每路公交动向，加上附近站点搜索(8684地图)、实时问路(8684广场)、查询(8684出行)、线路纠错等多种实用工具，更好地助你出行。

1 <form action="/example/html/form_action.asp" method="get">
2   <p>Email: <input type="text" name="email" /></p>
3   <p>Pin: <input type="text" name="pin" maxlength="18" /></p>
4   <input type="submit" value="Submit" />
5 </form>

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28. value 属性 语法：<input value="value"/>

定义和用法：

value 属性为 input 元素设定值。

对于不同的输入类型html 表单提示，value 属性的用法也不同：

注释：<input type="checkbox"> 和 <input type="radio"> 中必须设置 value 属性。

注释：value 属性无法与 <input type="file"> 一同使用。

例子：

1 <form action="/example/html/form_action.asp" method="get">
2   First name: <input type="text" name="fname" value="George" /><br />
3   Last name: <input type="text" name="lname" value="Bush" /><br />
4   <input type="submit" value="Submit form" />
5 </form>

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29. width 属性 （HTML5中的新属性） 语法：<input/>

定义和用法：

width 属性只适用于 <input type="image">，它规定 image input 的宽度。

提示：为图片指定高度和宽度是一个好习惯。如果设置了这些属性，当页面加载时会为图片预留需要的空间。而如果没有这些属性，则浏览器就无法了解图像的尺寸，也就无法为其预留合适的空间。情况是当页面和图片加载时，页面布局会发生变化。

例子：

1 <form action="demo_form.asp" method="get">
2 First name: <input type="text" name="fname" /><br />
3 Last name: <input type="text" name="lname" /><br />
4 <input type="image" src="img_submit.gif" alt="Submit" width="128" height="128"/>
5 </form>

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